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Research Article

Enhanced electrochemical performance of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte by anion doping

Jingrui Kang1, Xu Guo1, Rui Gu1, Honglei Hao1, Yi Tang1, Jiahui Wang1, Li Jin1, Hongfei Li2( ), Xiaoyong Wei1( )
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
School of Energy and Materials, Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai Polytechnic University, Shanghai 201209, China
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Graphical Abstract

We present the enhanced ionic conductivity of Li1.3Al0.3Ti1.7(PO4)3 (LATP) solid electrolyte by anion doping. The successful introduction of Cl− makes lithium ions migrate more easy in the nanochannel of M3-M1-M3. The Li metal symmetric cell and the solid-state Li|LATPCl0.3|NCM811 (LATPCl0.3 = LATP modified with 0.3 mol LiCl and NCM811 = LiNi0.8Co0.1Mn0.1O2) battery both exhibit a better cycle performance.

Abstract

Nowadays, the majority of the studies on the substitution are focused on cations (such as Y3+, Ti4+, P5+, etc.) in Li1.3Al0.3Ti1.7(PO4)3 (LATP), while there are few studies on the substitution of anion O2−. In this work, the modified LATP with a series of LiCl (LATPClx, x = 0.1, 0.2, 0.3, 0.4) additives is prepared to enhance ionic conductivity. The successful introduction of Cl− makes the length of the c axis decrease from 20.822(2) to 20.792(1) Å, and the bulk conductivity of 2.13 × 10−3 S·cm−1 is achieved in LATPCl0.3. Moreover, the Al/Ti-O1/Cl1 and Al/Ti-O2/Cl2 distance decrease, while the Li1-O2/Cl2 distance increases. Lithium ions migrate more easily in the nanochannel of M3-M1-M3. In addition, the LiCl additive increases the relative density and the grain boundary conductivity of LATPClx compounds. Naturally, a higher ionic conductivity of 2.12 × 10–4 S·cm−1 and a low activation energy of 0.30 eV are obtained in LATPCl0.3. Correspondingly, the symmetric cell exhibits a low overpotential of ±50 mV for over 200 h in LATPCl0.3. The solid-state Li|LATPCl0.3|NCM811 (NCM811 = LiNi0.8Co0.1Mn0.1O2) battery exhibits high initial capacity 185.1 mAh·g−1 with a capacity retention rate of 95.4% after 100 cycles at 0.5 C. This result suggests that LiCl additive is an effective strategy to promote electrochemical properties of LATP solid electrolyte and can be considered for reference to other inorganic solid electrolytes systems.

Keywords

Li1.3Al0.3Ti1.7(PO4)3 (LATP) solid electrolyteanion dopingionic conductivitycyclic performance

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Nano Research
Volume 17 Issue 3,
March 2024
Pages 1465-1472
DOI: 10.1007/s12274-023-5890-9
Cite this article:
Kang J, Guo X, Gu R, et al. Enhanced electrochemical performance of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte by anion doping. Nano Research, 2024, 17(3): 1465-1472. https://doi.org/10.1007/s12274-023-5890-9
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Received: 27 April 2023
Revised: 31 May 2023
Accepted: 31 May 2023
Published: 26 July 2023
© Tsinghua University Press 2023
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